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  Indian J Med Microbiol
 

Figure 2: Illustrative case - Patient 9-presented with a severe neurological deterioration 3 years after a posterior fossa decompression for treatment a tonsillar herniation. (a) Sagittal T2 sequence magnetic resonance imaging showing odontoid compression over the brainstem and upper spinal cord. (b and c) Flexion and extension CT scan sagittal reconstructions showing atlanto-axial instability. (d) CT scan 3D reconstruction of a unilateral C1-C2 fusion and unilateral occipito-C2 fusion. (e) Note the C1 lateral mass screws and the fusion of the occipital condyle with C1. (f) Laminar screws at C2. (g) Coronal CT scan showing the left C1 screw in the lateral mass. (h) Intraoperative view of the final construction

Figure 2: Illustrative case - Patient 9-presented with a severe neurological deterioration 3 years after a posterior fossa decompression for treatment a tonsillar herniation. (a) Sagittal T2 sequence magnetic resonance imaging showing odontoid compression over the brainstem and upper spinal cord. (b and c) Flexion and extension CT scan sagittal reconstructions showing atlanto-axial instability. (d) CT scan 3D reconstruction of a unilateral C1-C2 fusion and unilateral occipito-C2 fusion. (e) Note the C1 lateral mass screws and the fusion of the occipital condyle with C1. (f) Laminar screws at C2. (g) Coronal CT scan showing the left C1 screw in the lateral mass. (h) Intraoperative view of the final construction